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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

LEIGH, Olufisayo Oluwadamilare  and  FAYEMI, Oluremi Eric. Observations on Estrus as Monitored by Receptivity to Mating Activity and Pattern of Vaginal Exfoliates In Trypanosoma brucei ­ Infected WAD Goat does Synchronized with Estrumate®. Int. J. Morphol. [online]. 2011, vol.29, n.3, pp.762-768. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022011000300016.

The effects of experimental Trypanosoma brucei infection on receptivity to mating activity and pattern of vaginal exfoliates were monitored using twenty-one adult WAD goats which were synchronized with double injection, seven days apart of Estrumate®. The twenty-one goats consisted of 3 bucks and 18 does. The does were randomly divided into control group 'A' having 10 does and test group 'B' with 8 does. The goats were fed with Elephant grass in the morning and commercial feed containing 15.23% CP at the rate of 0.25kg/head in the afternoons. Freshwater was provided ad libitum. Results showed that while all the control does were observed to stand to be mounted and mated, none of the infected does did. Also, the pattern of the mean percentage vaginal exfoliated cell types encountered between the control and infected doe groups were converse. While parasabal cells changed from 2.90±0.03% during proestrus through 3.05±0.46% during estrus to 2.42±0.08% at diestrus in the control does, it changed from 22.07±0.56% during expected proestrus through 8.48±0.05% during expected estrus to 28.05±1.09% respectively in the infected does. In like manner, intermediate cell changed from 11.10±0.03% during proestrus through 11.10±0.31% during estrus to 1.21±1.00% during diestrus in control does while it changed from 27.27±0.08% during expected proestrus through 42.37±2.39% during expected estrus to 40.24±1.06 % during expected diestrus in infected does. Similarly, superficial cells changed from 56.25±0.75% during proestrus through 63.70±1.05% during estrus to 7.37±0.01% during diestrus while it changed from 0.00% during expected proestrus through 3.39±0.02% during expected estrus to 63.70±1.05% during estrus to 6.10±0.01% during expected diestrus. In the control does, the mean percentage neutrophils changed from 29.75±0.04% during proestrus through 22.14±0.65% during estrus to 86.70±1.68 during diestrus while in the infected does, it changed from 50.64± 0.68% during expected proestrus through 45.76±6.05% during expected estrus to 25.61±2.85% during expected diestrus. The findings in the infected group of does suggest an arrest of the physiological processes leading to the exhibition of "heat" and contradict the observation in the control does. It is concluded that Trypanosoma brucei infection in the WAD does is the cause of anoestrous observed in this study.

Keywords : Receptivity to mating; Vaginal exfoliates; Trypanosoma brucei; WAD does; Estrumate®.

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